Abstract: The technical field of the invention is that of microactuators designed for mechanical, chemical, electrical or thermal functions in microsystems, for microelectronic applications such as chips, or biomedical applications such as cards incorporating microfluidics. The invention concerns a microactuator (1, 60) comprising a chamber (2, 63) machined in a solid support (3) and containing a pyrotechnic charge (6). Said microactuator (1, 60) is essentially characterised in that the chamber (2, 63) is partly delimited by a deformable membrane (4, 62), such that the gases emitted by combustion of the pyrotechnic charge (6) enable to increase the volume of said chamber (2, 63) by deforming said membrane (4, 62) while maintaining intact the solid walls of the chamber (2, 63).

Abstract: The technical field of the invention is that of pre-filled and disposable needleless syringes, used for intradermal, subcutaneous and intramuscular injections of liquid active principle for therapeutic use in human and veterinary medicine. The inventive syringes (1) are mainly characterised in that they function with a pyrotechnic charge (6) consisting of a mixture of powder with high burning rate and a powder with low burning rate. Indeed, the combustion of the powder with a high burning rate enables to communicate instantly, through a piston (3), a very high speed to the active principle (4), whereas the combustion of the powder with a low burning rate enables to maintain a threshold pressure level to proceed with the injection, so as to ensure that the active principle (4) penetrates through the skin. Thus, the injection is properly and homogeneously without any loss of active liquid (4).

Abstract: A device for igniting a solid pyrotechnic charge, including a conducting track, wherein the track consists of a conducting fluid deposited at least partially on the pyrotechnic charge, the pyrotechnic charge is deposited on a solid support and covers an empty cavity of the support, and the cavity forms a empty space between the pyrotechnic charge and the support.

Abstract: The invention concerns the field of needless syringe for injecting liquid active principle for therapeutic purposes. It concerns a syringe wherein the active principle (1, 10) is initially placed between an injector (2, 22) comprising at least an injection duct (3, 23) contacted with the skin and a mobile wall (4, 24) separated from thrusting means (5, 25) displaced by gases of propellant generator (7, 27) pressurising and expelling the active principle. Said syringe aims at quickly providing a high expelling speed of the liquid to efficiently perforate the skin and improve bioavailability. Said syringe is characterised in that said thrusting means (5, 25) comprising temporary retention device (6, 26) deactivated by the operation of the propellant generator (7, 27).

Abstract: The invention concerns the technical field of needleless syringes for injecting an active principle for therapeutic purposes. More particularly, it concerns a needleless syringe for injecting an active principle (7, 70) initially set between an injector (1, 10) comprising at least an injection nozzle (50, 50′, 60′) contacted with the skin and a wall (8) mobile under the effect of a propelling system (9) pressurizing and expelling the active principle through the injector located at the downstream end (2, 20) of the syringe. In order to produce nozzles passing through a considerable injector thickness and to control the jet coherence distance, said injector (1, 10) comprises a support (3, 21) with at least a housing (4, 40) wherein are stacked plates (51, 61, 91, 51′, 71′, 91′, 52, 92) each comprising an equal number of orifices aligned to form at least a nozzle (50, 50′, 60′) through the stack.

Abstract: The technical field of the invention is that of needleless pre-filled disposable syringes, operating with a gas generator, and used for intradermal, subcutaneous and intramuscular injections, of a liquid active principle for therapeutic use in human and veterinary medicine. The inventive needleless syringes use a reservoir (5) consisting of a tube (6) closed by an upstream plug-piston (7) and a downstream plug-piston (8) between which is contained the liquid active principle. Said needleless syringes are characterized in that they are capable of injecting a variable amount of liquid active principle (9) by adapting, through displacement of the downstream plug-piston (8) in the tube (6) the volume included between the two plug-pistons (7,8) to the amount of active principle (9) to be injected.

Abstract: The technical field of the invention is that of pre-filled and disposable needleless syringes, used for intradermal, subcutaneous and intramuscular injections of liquid active principle for therapeutic use in human and veterinary medicine. The inventive syringes (1) are mainly characterised in that they function with a pyrotechnic charge (6) consisting of a mixture of powder with high burning rate and a powder with low burning rate. Indeed, the combustion of the powder with a high burning rate enables to communicate instantly, through a piston (3), a very high speed to the active principle (4), whereas the combustion of the powder with a low burning rate enables to maintain a threshold pressure level to proceed with the injection, so as to ensure that the active principle (4) penetrates through the skin. Thus, the injection is properly and homogeneously without any loss of active liquid (4).

Abstract: The technical field of the invention is that of needleless syringes used for injecting active principles in powder form for therapeutic purposes. The invention concerns a needleless syringe (1) comprising successively a gas generator (2), a gas expanding chamber (3), means for retaining active particles and an ejection tube (4). The invention is characterised in that the particle retaining means consists of an inner seal (14) having at least a cavity (15), the inner seal (14) serves both to contain the active principle and to generate a shock wave when it is ruptured.

Abstract: The invention relates to solid compositions that can decompose generating hydrogen in a self-sustaining combustion reaction after this reaction has been initiated by an appropriate heat source. These compositions comprise an alkali metal borohydride and an oxidizing mineral ammonium salt of formula NH4Y, in which Y represents a group consisting only of nitrogen and oxygen. The ratio of the weight content of alkali metal borohydride to the weight content of the salt of general formula NH4Y is between 1 and 4. Thus, high hydrogen mass yields are obtained, of around 8 to 14%, thereby making it possible to reduce the size and the weight of the hydrogen generators used in certain systems, especially in proton exchange membrane fuel cells.

Abstract: The invention concerns the field of needleless syringes for injecting a liquid active principle. It improves bioavailability by providing injection at two speed levels. The syringe comprises a reservoir (2) contained between an injector (3) and push means subjected to the action of a gas generator (7), said push means comprising an end, directed towards the active principle, which forms a delivery head (4) whereof the cross-section is smaller than the powering head (6) cross-section, the powering travel (C1) in the power cylinder (10) being shorter than the height (H1) of the active principle reservoir (2).

Abstract: The technical field of the invention is that of devices for igniting pyrotechnic charges, and more specifically those suitable for small pyrotechnic charges which can be found in microsystems such as microvalves or micropumps.

Abstract: The invention concerns a needleless syringe (1) comprising a trigger, a gas generator (2) prolonged by a gas expansion chamber (3), a system for retaining particles and an ejection tube (4). The invention is characterised in that the particles are housed outside the ejection tube conduit (4) and the gases cause the particles to reach inside said tube (4) by displacing a plunger (13), prior to speeding them up by wave shock inside the tube (4).